Table 2.
Basic rhythms in the two episodes of clean air and elevated air pollution
| Observed arrhythmia | Clean air (n = 21) | Polluted air (n = 21) | p-value |
|---|---|---|---|
| Basic rhythm | |||
| Total beats (×1000) | 102.6 ± 17.0 | 100.7 ± 12.7 | 0.291 |
| Average heart rate (min) | 76.2 ± 8.0 | 75.4 ± 7.5 | 0.677 |
| Minimum heart rate (min) | 48.5 ± 7.0 | 51.7 ± 8.4 | 0.231 |
| Maximum heart rate (min) | 128.9 ± 17.7 | 115.1 ± 32.2 | 0.003 |
| Heart rate variability | |||
| SDNN (ms) | 153.1 ± 26.4 | 190.1 ± 98.6 | 0.263 |
| SDNNs (ms) | 72.5 ± 17.2 | 110.2 ± 78.7 | 0.089 |
| pNN50 (%) | 16.0 ± 10.5 | 17.1 ± 9.2 | 0.420 |
| TRIA (ms) | 648.0 ± 149.8 | 624.5 ± 124.4 | 0.326 |
| SDANN (ms) | 136.0 ± 29.5 | 157.2 ± 97.0 | 0.940 |
| r-MSSD (ms) | 58.5 ± 26.4 | 99.0 ± 58.2 | 0.019 |
| NHR (min) | 63.0 ± 15.7 | 68.9 ± 10.6 | 0.121 |
| QT-min (ms) | 250.5 ± 27.8 | 251.4 ± 22.8 | 0.920 |
| QT-max (ms) | 443.5 ± 29.8 | 446.6 ± 40.0 | 0.999 |
| QTc (ms) | 419.1 ± 25.2 | 426.2 ± 22.4 | 0.529 |
SDNN standard deviation of normal RR intervals, SDNNs standard deviation of all normal-to-normal intervals, pNN50 percentage of the adjacent normal-to-normal intervals that differed by more than 50 ms, TRIA heart rate variability triangular index, SDANN standard deviation of the means of all corrected RR intervals calculated at 5 min intervals, r-MSSD root mean square of successive RR interval differences, NHR normalized heart rate, QT-min minimum of QT interval, QT-max maximum of QT interval, QTc corrected QT interval